Application:AccelService

From WebOS Internals

AccelService - Version: Pre-Alpha 0.0.3 (7 Aug 2009)

Deprecated

This service is deprecated, and has been removed from the feeds. WebOS 1.3.5 and above include an official API for adjusting the accelerometer resolution. The StageController.setWindowProperties() method now supports the fastAccelerometer property to increase the frequency of accelerometer events from 4Hz to 30Hz.

Summary

This service provides access to the accelerometer driver's poll_interval parameter. As of webOS 1.1.0, this interval is not accessible from application development and is set to 250ms. This makes most accelerometer driven applications choppy and slow. With this service, the poll_interval can be changed dynamically by the application.

The four methods exposed to the user are:

getPollFreq()

returns the frequency in HZ of the accelerometer events

getPollPeriod()

returns the period in ms of the accelerometer events

setPollFreq(freq)

sets the frequency in HZ of the accelerometer events

setPollPeriod(period)

sets the period in ms of the accelerometer events

NOTE: This service does not modify the hardware, it simply increases the rate at which the driver sends accelerometer events to the application handlers listening for the 'acceleration' event.